Discussion
Hi Guys.
I've kept away from here because generally the Chimaera 400HC is being very well behaved, but I do have one probelem, I hope you can help me with, as the weather warms up.
On a cold start, the initial idle is quite lumpy, as soon as I touch the throttle the revs die and the engine bogs. It only comes back to life by pressing the throttle harder and getting the coughing engine up to about 3000 RPM. This sounds to me like the Choke being too rich, the cars fine after about a mile, but reversing out of the drive at 06:30 at 3000 rpm is upseting the neighbours.
Do people agree it sounds like the choke? if not what do you think. If it is the choke can anyone tell me how to adjust it, I can't find it in Steve Heaths book. Is it time to buy that Range Rover Haynes Manual?
Many thanks for your time.
regards
Graham (Chimp 400HC)
I've kept away from here because generally the Chimaera 400HC is being very well behaved, but I do have one probelem, I hope you can help me with, as the weather warms up.
On a cold start, the initial idle is quite lumpy, as soon as I touch the throttle the revs die and the engine bogs. It only comes back to life by pressing the throttle harder and getting the coughing engine up to about 3000 RPM. This sounds to me like the Choke being too rich, the cars fine after about a mile, but reversing out of the drive at 06:30 at 3000 rpm is upseting the neighbours.
Do people agree it sounds like the choke? if not what do you think. If it is the choke can anyone tell me how to adjust it, I can't find it in Steve Heaths book. Is it time to buy that Range Rover Haynes Manual?
Many thanks for your time.
regards
Graham (Chimp 400HC)
Mine does the same! Though not as badly by the sound of it!
Fuel injection desn't really have a choke as such, extra rich fuelling being catered for by the ECU knowing how cold it is etc.
Just keep the revs up for a few moments and it settles down to drivable, bit of a pain though.
There was a similar thread a while ago (ROUGH RUNNING WHEN COLD - 19/12/01) which may go some way to explaining this.
Mine's due a service soon, so I'll see if that helps matters as well.
Cheers,
Andy
Edited by crimsonchim on Friday 11th January 16:08
Fuel injection desn't really have a choke as such, extra rich fuelling being catered for by the ECU knowing how cold it is etc.
Just keep the revs up for a few moments and it settles down to drivable, bit of a pain though.
There was a similar thread a while ago (ROUGH RUNNING WHEN COLD - 19/12/01) which may go some way to explaining this.
Mine's due a service soon, so I'll see if that helps matters as well.
Cheers,
Andy
Edited by crimsonchim on Friday 11th January 16:08
My Chimaera 500 was a pain when it was REALLY cold over New Year. I was told once that there is a 9th injector that runs the engine v. rich until it warms up slightly. If I stall mine within a minute of starting from v. cold, it won't restart 'cos of flooding! I had to get out and leave it for 10 minutes before it would restart. (Its fine when weather above 5 degeees C)
I'd advise starting it and then leaving it to warm slightly for a couple of minutes (dry windows, remove hood
etc) Neighbours might not like it though!
I'd advise starting it and then leaving it to warm slightly for a couple of minutes (dry windows, remove hood
etc) Neighbours might not like it though! quote:
If it is the choke can anyone tell me how to adjust it, I can't find it in Steve Heaths book.
It is not in there as there is no choke (or nineth injector) to overrich the fuel. ANy choking is done by the ECU extending the fuel pulses to the injectors in response to the temperature it reads. One of the problems can be that until the car starts to warm up, the ECU will continue to enrichen the mixture. If this is done too much the plugs can foul and the car flood and fail to start. This can be so bad that the plugs need removing, cleaning and heating with a warm air gun to dry them before the the engine will start.
This is often caused by slight problems in the injection system sensors being slightly out or the way the ECU is set up. A possible problem is a faulty injector giving an overrich mixture.
On my Griff and on the 520, I don't even bother to wait for the car to warm up as I find that driving off keeping the revs at low 2-2500 revs is the quickest and easiest way to get the engine behaving normally as idling on tickover when cold tends to cause problems if the car stalls. As you use the revs and the car moves, the ECU starts mapping instead of using a set of pre-defined maps.
Steve
www.tvrbooks.co.uk
I gather that this is a comon problem and improves with experience of 'management'. I have recently aquired my 96 400. I have found that it is quite lumpy on start up particularly lately when the weather became really cold. I try to run for a few minutes, whilst removing hood etc, and then moving. I made the mistake recently of reversing out of the garage too soon, stalled on turning and then could not restart for 15 minutes or so. After a short warm up drive though, did she go or what!!
Thanks everyone for putting my mind at rest. It seems my chimp is just about the same as everyone elses. 
It looks like I'll just have to give it time to warm up, although just driving off seems like it may be the best solution, I can't risk stalling it reversing, up hill, before driving off.
Thanks again
Roll on the summer
Graham (Chimp 400HC)
It looks like I'll just have to give it time to warm up, although just driving off seems like it may be the best solution, I can't risk stalling it reversing, up hill, before driving off.
Thanks again
Roll on the summer
Graham (Chimp 400HC)
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